92 
HYMENOMYCETES 
HYDNUM 
(From the Gr. hydnon, a truffle—curiously used by Linnaeus 
for this genus) 
H. imbricatum (imbrex, a tile—from the scaly pileus), 
“ Scaly Urchin.” Plate XXXI. n. 
P. 2-5 in., mouse-brown or reddish, with imbricated scales. 
F. reddish-brown above, remainder white. Spines long, 
crowded, greyish, decurrent on the thick whitish central 
stem. Singly or in twos and threes in pine woods in aut. 
Uncommon. Esculent. 
H. repandum (: vepandus , repand), “ Urchin of the Woods.” 
Plate XXXI. 1. 
Altogether pale yellow or reddish, or stem and spines of a 
lighter colour. P. 2-6 in., spines short, crowded, brittle. 
S. 2-4 in., usually central, thick, fleshy, sometimes covered 
with white down. Subgregarious in woods in aut., especially 
under beeches. Common. Esculent. 
H. auriscalpium (auriscalpium, an ear-pick—from the shape). 
Plate XXXI. 3. 
P. J-i in., dark brown, hairy, sub-rotund. Spines crowded, 
dark. S. lateral, 2-3 in., dark, base shaggy, often buried to 
some depth in fir leaves. Common to pine woods, attached 
to cones of Scotch pine. Often overlooked. 
H. ochraceum (ochraceus, ochrey-yellow). Plate XXXI. 10. 
Effuso-reflexed or entirely resupinate on dead branches, 
yellowish. P. 1-5 in., thin, tough, zoned. Spines very 
minute. Whole plant easily separable from the matrix. 
Common in aut. and win. on trunks and branches, bramble 
stems, etc. 
SISTOTREMA 
(Gr. seistos, shaken; trema, a pore—from the irregular 
arrangement of the spines and their interstices) 
S. confluens (from the confluent habit). Plate XXXI. 5. 
P. 1 in., somewhat depressed, fleshy, white at first, then 
